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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
Find the electron distribution for the element that has atomic number 17 and write its valency.
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Answer

Atomic no. of element = 17
Electronic configuration 2, 8, 7
Since it requires one more electron to complete its stable gas configuration, so the valency is 1.

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